BVN BVN TM PEV2 – Boilers Head Office – Department Technology Equipment - V0 – November 2009

CONTENT 1 – Objectives 2 – General description of boilers 3 – Classification Rules requirements

1 – Objectives

4 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Pressure vessels – Objectives To be familiar with Classification Rules regarding boilers Study of Classification Rules requirements for boilers

2 – General description of boilers

6 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Boilers could be categorized according to :  The intended use : Main Auxiliary  The type of heated media : Steam Overheated water Thermal oil  The geometry : Fire tube boilers Water tube boilers Coils boilers Composite boilers  The type of heat input : Burner Exhaust gas Composite boilers

7 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Main boiler Exclusively steam boilers Mostly superheated steam for steam turbine propulsion: LNGC and LPGC Seldom saturated steam for alternative piston engines Auxiliary Steam Mostly saturated steam for heating purpose of fuel or cargo Overheated water For heating purpose of fuel or cargo or for accommodations Thermal Oil For heating purpose of fuel or cargo

8 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Steam Pressure is generally between 7 to 80 bar Temperature is generally between saturation and 500°C Overheated water Pressure is kept at a value avoiding vaporization with a temperature margin generally between 15 to 30°C Thermal oil Organic or synthetic base able to be heated up to °C (at least 50°C below distillation point)

9 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Fire tube boiler

10 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Fire tube boiler type 3 pass wet back

11 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Fire tube boiler type 3 pass semi wet back

12 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description FIRE TUBE BOILER Main usual characteristics Pressure is generally between 7 to 20 bar Temperature is generally saturation with possible overheating generally less 30°C Vaporisation between 50 kg/h to 35 t/h Well adapted for power variations due to thermal inertia Thermal efficiency > 90% (93% with economizer) Particulars Furnace under external pressure calculated for elastic strength and for buckling with a maximum thickness of 22 mm to avoid excessive thermal gradient Large end plates with particular calculation Special care for type of welded joints: furnace/end plate & end plate/shell

13 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description WATER TUBE BOILER

14 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description WATER TUBE BOILER Main usual characteristics Pressure is generally between 30 to 80 bar Generally overheated steam up to 500°C Vaporisation of more than 20 t/h Very well adapted for power variations Thermal efficiency  85% Particulars Internal pressure parts only, tubes only exposed to heat transfer >  no thickness limit of drums > no size limit Special care for welded joints, in particular longitudinal of drums

15 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description Steam BoilerThermal Oil Heater COIL BOILER

16 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description STEAM COIL BOILER Main usual characteristics Pressure is only depending of the steam system, Production of mix steam + water (10% m.m) need separator Vaporisation from 250 kg/h to 8 t/h Thermal efficiency  90% Very well adapted for intermittent use Very badly adapted for power variation Particulars “One pass boiler” with volumetric feed water pump Internal pressure parts only, Tubes only exposed to heat transfer > progressive increase of temperature along the coil > fur deposit localized in one point > good water quality

17 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description THERMAL OIL COIL BOILER Main usual characteristics Pressure is only depending of the system, generally 2 to 6 bar Power from 100 kW to 10 MW Temperature up to 350°C Thermal efficiency  90% Well adapted for power variation Not well adapted for intermittent use Particulars Single or parallel coils with hydrodynamic circulating pump Internal pressure parts only Tubes only exposed to heat transfer, Risk of calefaction of thermal oil > fluid flow always to be ensured Need of an expansion tank under inert gas pressure

18 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description COMPOSITE BOILER according geometry

19 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – General description COMPOSITE BOILER according to heating media : Oil fired burner and/or exhaust gas

3 – Classification Rules requirements for boilers

21 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Classification Rules requirements to be studied in general

22 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Classification Rules requirements to be specially studied Part C Chapter 1 Section 3 Article 1 « General » Article 4 « Fabrication and welding » Article 7 « Material test, workshop inspection and testing, certification »

23 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Documentation to be submitted for type approval or case-by- case approval by HO or LPO

24 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Documentation to be submitted for type approval or case-by- case approval by HO or LPO

25 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Production phase - Boilers individual certificate Pay attention to BV certificates for Class I pressure vessels BV Product certificate for materials of pressure parts Work’s certificate for materials of pressure parts

26 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Production phase - Boilers individual certificate Pay attention to BV certificates

27 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Production phase – Boilers individual certificate Typical tasks for survey : - Check availability of reviewed drawings (as per type approval as relevant) - Check materials and components certificates, as relevant - Check Welding Procedure Specification and Welding Procedure Qualification Records - Check welders certificates - Check fabrication conditions (cleanliness, welding preparation etc.) - Check non-destructive testing operators certification - Witness hydraulic pressure testing - General visual examination

28 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Characteristics for certificates, as applicable :

29 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009 Boilers – Part C Ch 1 Sec 3 Typical tasks for survey, as applicable :

30 Bureau Veritas S.A. internal use only – Boilers – BVN TM PEV2 – V0 – November 2009